<div class="num-selector" data-id="{{id}}" data-index="{{index}}">
  <button class="item btn" data-field="minus">-</button>
  <input type="text" class="item input" value="{{num}}" readonly id="J_numInput_{{id}}" />
  <button class="item btn" data-field="add" data-limitation="{{limitation}}">+</button>
</div>